Posted by: Jan flood "oakridgefarm@gmail.com"
> Wanted a storm door on the front
> Wanted a storm door on the front
> Beautiful view so wanted a full view,
> Since it faces direct west it also gets full afternoon sun.
> Just read an article that storm doors are not recommended
> in areas that get full sun as the interior (between the glass)
> can heat too much and break the glass.
> Maybe just good screens doors would be OK and certainly cheaper.
Hi Jan;
There are a few factors that can effect this situation.
Definitely storm doors can produce high heat, since
you are basically creating a glazed Solar collector.
I have seen plastic trim, on inner doors, literally melt.
So, the color of the inner door will effect it. The darker
the door, the less light it will be reflected back out
through the storm door, so the hotter it can get.
Two basic ways to limit the heat is to block sunlight
from getting in, or reflect it back out. You could also
vent the heat away, and heat is conducted through
the storm door glass, when it is cool enough outdoors.
Overheating occurs when the storm door glass is left
in, during hot weather. Your West facing door is
potentially the most vulnerable exposure, because
the sun is low in the western sky, during the hottest
part of the day, in hottest seasons. However, if you
take the glass out during hot weather, you will not
have that problem.
A less energy efficient solution would be to open
the door to the house. But, that would add heat to
your house interior, and would not prevent the
problem when you leave the door closed for
any reason.
So, what is my recommendation? (BTW....I am
a retired Solar heated building designer and made
my living by understanding how to control the sun's
heat in houses). It is easy. Get a storm door that
has tinted glass (or put a tinting film on clear glass)
so it blocks the sunlight from ever getting between
the doors. Tinted glass will protect you from human
screw-ups, like not removing the glass early enough
in Spring. As you mentioned, you could also just use
a screen door, with no glass. Depending on the type
of primary door, the added insulation value of a storm
door, may not be all that significant (though you may
want it for security reasons). For instance, if you have
a solid door (little or no glass) that is the fiberglass
type, it will have an Rvalue of about R7 and will also
be very stable against warping and leaking air around
the edges. In that case, a storm door will not make
much Winter heat loss difference.
BTW....modern storm doors have tempered glass,
so it is highly unlikely that heat would ever cause
it to shatter,
-Laren Corie-
Solar and Energy Efficient Building Design, since 1975
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Posted by: Laren <sylvanabode@gmail.com>
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